Service
Manual
Inverter Pair
Wall Mounted Type FTX-N Series
SiUS041638E
[Applied Models]
z Inverter Pair : Cooling Only
z Inverter Pair : Heat Pump
SiUS041638E
i Table of Contents
Inverter Pair
Wall Mounted Type
FTX-N Series
zCooling Only
Indoor Unit
FTX30NVJU
FTX36NVJU
Outdoor Unit
RK30NMVJU
RK36NMVJU
zHeat Pump
Indoor Unit
FTX30NVJU
FTX36NVJU
Outdoor Unit
RX30NMVJU
RX36NMVJU
SiUS041638E
Table of Contents ii
1. Safety Cautions........................................................................................... v
1.1 Warnings and Cautions Regarding Safety of Workers................................. v
1.2 Warnings and Cautions Regarding Safety of Users....................................vii
2. Icons Used .................................................................................................. x
Part 1 List of Functions ................................................................... 1
1. Functions.....................................................................................................2
Part 2 Specifications ....................................................................... 3
1. Specifications ..............................................................................................4
1.1 Cooling Only................................................................................................. 4
1.2 Heat Pump ................................................................................................... 5
Part 3 Printed Circuit Board Connector Wiring Diagram ................ 6
1. Indoor Unit...................................................................................................7
1.1 FTX30/36NVJU ............................................................................................ 7
2. Outdoor Unit................................................................................................9
2.1 RK(X)30/36NMVJU ...................................................................................... 9
Part 4 Functions and Control......................................................... 12
1. Main Functions..........................................................................................13
1.1 Temperature Control .................................................................................. 13
1.2 Frequency Principle.................................................................................... 13
1.3 Airflow Direction Control............................................................................. 15
1.4 Fan Speed Control for Indoor Unit ............................................................. 16
1.5 Program Dry Operation .............................................................................. 17
1.6 Automatic Operation................................................................................... 18
1.7 Thermostat Control..................................................................................... 19
1.8 NIGHT SET Mode ...................................................................................... 20
1.9 ECONO Operation ..................................................................................... 20
1.10 INTELLIGENT EYE Operation ................................................................... 21
1.11 POWERFUL Operation .............................................................................. 22
1.12 Clock Setting .............................................................................................. 23
1.13 WEEKLY TIMER Operation ....................................................................... 24
1.14 Other Functions.......................................................................................... 30
2. Thermistor Functions ................................................................................31
3. Control Specification .................................................................................33
3.1 Mode Hierarchy .......................................................................................... 33
3.2 Frequency Control...................................................................................... 34
3.3 Controls at Mode Changing/Start-up.......................................................... 36
3.4 Discharge Pipe Temperature Control......................................................... 38
3.5 Input Current Control.................................................................................. 39
3.6 Freeze-up Protection Control ..................................................................... 40
3.7 Heating Peak-cut Control ........................................................................... 40
3.8 Outdoor Fan Control................................................................................... 41
SiUS041638E
iii Table of Contents
3.9 Liquid Compression Protection Function.................................................... 41
3.10 Defrost Control ........................................................................................... 42
3.11 Electronic Expansion Valve Control ........................................................... 43
3.12 Malfunctions ............................................................................................... 46
Part 5 Remote Controller ............................................................... 47
1. Remote Controller .....................................................................................48
Part 6 Service Diagnosis................................................................ 50
1. General Problem Symptoms and Check Items .........................................52
2. Troubleshooting with LED .........................................................................53
2.1 Indoor Unit.................................................................................................. 53
2.2 Outdoor Unit ............................................................................................... 53
3. Service Diagnosis .....................................................................................54
4. Troubleshooting ........................................................................................57
4.1 Error Codes and Description ...................................................................... 57
4.2 Indoor Unit PCB Abnormality ..................................................................... 58
4.3 Freeze-up Protection Control/Heating Peak-cut Control ............................ 60
4.4 Indoor Fan Motor (DC Motor) or Related Abnormality ............................... 61
4.5 Thermistor or Related Abnormality (Indoor Unit)........................................ 63
4.6 Low-voltage Detection or Over-voltage Detection...................................... 64
4.7 Signal Transmission Error (between Indoor Unit and Outdoor Unit) .......... 66
4.8 Signal Transmission Error on Outdoor Unit PCB ....................................... 68
4.9 Mismatching of Indoor Unit and Outdoor Unit ............................................ 69
4.10 Outdoor Unit PCB Abnormality................................................................... 70
4.11 OL Activation (Compressor Overload) ....................................................... 71
4.12 Compressor Lock ....................................................................................... 73
4.13 DC Fan Lock (Outdoor Fan)....................................................................... 74
4.14 Input Overcurrent Detection ....................................................................... 75
4.15 Four Way Valve Abnormality...................................................................... 76
4.16 Discharge Pipe Temperature Control......................................................... 78
4.17 High Pressure Control in Cooling ............................................................... 79
4.18 System Shutdown due to Compressor Internal Temperature
Abnormality ................................................................................................ 80
4.19 Compressor System Sensor Abnormality .................................................. 81
4.20 Position Sensor Abnormality ...................................................................... 82
4.21 CT or Related Abnormality ......................................................................... 84
4.22 Thermistor or Related Abnormality (Outdoor Unit)..................................... 86
4.23 Electrical Box Temperature Rise................................................................ 88
4.24 Radiation Fin Temperature Rise ................................................................ 89
4.25 Output Overcurrent Detection .................................................................... 90
5. Check ........................................................................................................92
5.1 Thermistor Resistance Check .................................................................... 92
5.2 Indoor Fan Motor Connector Output Check ............................................... 93
5.3 Power Supply Waveforms Check............................................................... 93
5.4 Electronic Expansion Valve Check............................................................. 94
SiUS041638E
Table of Contents iv
5.5 Four Way Valve Performance Check ......................................................... 95
5.6 Inverter Unit Refrigerant System Check..................................................... 95
5.7 Inverter Analyzer Check ............................................................................. 96
5.8 Rotation Pulse Check on the Outdoor Unit PCB ........................................ 98
5.9 Installation Condition Check....................................................................... 99
5.10 Discharge Pressure Check......................................................................... 99
5.11 Outdoor Fan System Check ..................................................................... 100
5.12 Main Circuit Short Check.......................................................................... 100
5.13 Capacitor Voltage Check.......................................................................... 101
5.14 Power Module Check ............................................................................... 101
Part 7 Trial Operation and Field Settings.................................... 103
1. Pump Down Operation............................................................................104
2. Forced Cooling Operation .......................................................................105
3. Trial Operation ........................................................................................106
4. Field Settings ..........................................................................................107
4.1 Model Type Setting .................................................................................. 107
4.2 Temperature Display Switch .................................................................... 107
4.3 When 2 Units are Installed in 1 Room...................................................... 108
4.4 Facility Setting Switch (cooling at low outdoor temperature).................... 109
5. Silicone Grease on Power Transistor/Diode Bridge................................111
Part 8 Appendix............................................................................ 112
1. Piping Diagrams......................................................................................113
1.1 Indoor unit ................................................................................................ 113
1.2 Outdoor Unit ............................................................................................. 114
2. Wiring Diagrams......................................................................................115
2.1 Indoor Unit................................................................................................ 115
2.2 Outdoor Unit ............................................................................................. 116
3. Operation Limit........................................................................................117
Safety Cautions SiUS041638E
v
1. Safety Cautions
Be sure to read the following safety cautions before conducting repair work.
After the repair work is complete, be sure to conduct a test operation to ensure that the equipment
operates normally, and explain the cautions for operating the product to the customer.
Caution Items The caution items are classified into Warning and Caution. The Warning items are
especially important since death or serious injury can result if they are not followed closely. The
Caution items can also lead to serious accidents under some conditions if they are not
followed. Therefore, be sure to observe all the safety caution items described below.
Pictograms This symbol indicates an item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates a prohibited action.
The prohibited item or action is shown in the illustration or near the symbol.
This symbol indicates an action that must be taken, or an instruction.
The instruction is shown in the illustration or near the symbol.
1.1 Warnings and Cautions Regarding Safety of Workers
Warning
Do not store equipment in a room with fire sources (e.g., naked flames,
gas appliances, electric heaters).
Be sure to disconnect the power cable from the socket before
disassembling equipment for repair.
Working on equipment that is connected to the power supply may cause an
electrical shock.
If it is necessary to supply power to the equipment to conduct the repair or
inspect the circuits, do not touch any electrically charged sections of the
equipment.
If refrigerant gas is discharged during repair work, do not touch the
discharged refrigerant gas.
Refrigerant gas may cause frostbite.
When disconnecting the suction or discharge pipe of the compressor at
the welded section, evacuate the refrigerant gas completely at a well-
ventilated place first.
If there is gas remaining inside the compressor, the refrigerant gas or
refrigerating machine oil discharges when the pipe is disconnected, and it may
cause injury.
If refrigerant gas leaks during repair work, ventilate the area.
Refrigerant gas may generate toxic gases when it contacts flames.
Be sure to discharge the capacitor completely before conducting repair
work.
The step-up capacitor supplies high-voltage electricity to the electrical
components of the outdoor unit.
A charged capacitor may cause an electrical shock.
SiUS041638E Safety Cautions
vi
Do not turn the air conditioner on or off by plugging in or unplugging the
power cable.
Plugging in or unplugging the power cable to operate the equipment may cause
an electrical shock or fire.
Be sure to wear a safety helmet, gloves, and a safety belt when working
in a high place (more than 2 m).
Insufficient safety measures may cause a fall.
In case of R-32 / R-410A refrigerant models, be sure to use pipes, flare
nuts and tools intended for the exclusive use with the R-32 / R-410A
refrigerant.
The use of materials for R-22 refrigerant models may cause a serious accident,
such as a damage of refrigerant cycle or equipment failure.
Do not mix air or gas other than the specified refrigerant (R-32 / R-410A /
R-22) in the refrigerant system.
If air enters the refrigerant system, an excessively high pressure results,
causing equipment damage and injury.
Warning
Caution
Do not repair electrical components with wet hands.
Working on the equipment with wet hands may cause an electrical shock.
Do not clean the air conditioner with water.
Washing the unit with water may cause an electrical shock.
Be sure to provide an earth / grounding when repairing the equipment in
a humid or wet place, to avoid electrical shocks.
Be sure to turn off the power switch and unplug the power cable when
cleaning the equipment.
The internal fan rotates at a high speed, and may cause injury.
Be sure to conduct repair work with appropriate tools.
The use of inappropriate tools may cause injury.
Safety Cautions SiUS041638E
vii
1.2 Warnings and Cautions Regarding Safety of Users
Be sure to check that the refrigerating cycle section has cooled down
enough before conducting repair work.
Working on the unit when the refrigerating cycle section is hot may cause
burns.
Conduct welding work in a well-ventilated place.
Using a welder in an enclosed room may cause oxygen deficiency.
Caution
Warning
Do not store the equipment in a room with fire sources (e.g., naked
flames, gas appliances, electric heaters).
Be sure to use parts listed in the service parts list of the applicable model
and appropriate tools to conduct repair work. Never attempt to modify the
equipment.
The use of inappropriate parts or tools may cause an electrical shock,
excessive heat generation or fire.
If the power cable and lead wires are scratched or have deteriorated, be
sure to replace them.
Damaged cable and wires may cause an electrical shock, excessive heat
generation or fire.
Do not use a joined power cable or extension cable, or share the same
power outlet with other electrical appliances, since it may cause an
electrical shock, excessive heat generation or fire.
Be sure to use an exclusive power circuit for the equipment, and follow
the local technical standards related to the electrical equipment, the
internal wiring regulations, and the instruction manual for installation
when conducting electrical work.
Insufficient power circuit capacity and improper electrical work may cause an
electrical shock or fire.
Be sure to use the specified cable for wiring between the indoor and
outdoor units.
Make the connections securely and route the cable properly so that there is no
force pulling the cable at the connection terminals.
Improper connections may cause excessive heat generation or fire.
SiUS041638E Safety Cautions
viii
When wiring between the indoor and outdoor units, make sure that the
terminal cover does not lift off or dismount because of the cable.
If the cover is not mounted properly, the terminal connection section may cause
an electrical shock, excessive heat generation or fire.
Do not damage or modify the power cable.
Damaged or modified power cables may cause an electrical shock or fire.
Placing heavy items on the power cable, or heating or pulling the power cable
may damage it.
Do not mix air or gas other than the specified refrigerant (R-32 / R-410A /
R-22) in the refrigerant system.
If air enters the refrigerant system, an excessively high pressure results,
causing equipment damage and injury.
If the refrigerant gas leaks, be sure to locate the leaking point and repair
it before charging the refrigerant. After charging the refrigerant, make
sure that there is no leak.
If the leaking point cannot be located and the repair work must be stopped, be
sure to pump-down, and close the service valve, to prevent refrigerant gas from
leaking into the room. Refrigerant gas itself is harmless, but it may generate
toxic gases when it contacts flames, such as those from fan type and other
heaters, stoves and ranges.
When relocating the equipment, make sure that the new installation site
has sufficient strength to withstand the weight of the equipment.
If the installation site does not have sufficient strength or the installation work
is not conducted securely, the equipment may fall and cause injury.
Check to make sure that the power cable plug is not dirty or loose, then
insert the plug into a power outlet securely.
If the plug is dusty or has a loose connection, it may cause an electrical shock
or fire.
When replacing the coin battery in the remote controller, be sure to
dispose of the old battery to prevent children from swallowing it.
If a child swallows the coin battery, see a doctor immediately.
Warning
Safety Cautions SiUS041638E
ix
Caution
Installation of a leakage breaker is necessary in some cases depending
on the conditions of the installation site, to prevent electrical shocks.
Do not install the equipment in a place where there is a possibility of
combustible gas leaks.
If combustible gas leaks and remains around the unit, it may cause a fire.
Check to see if parts and wires are mounted and connected properly, and
if connections at the soldered or crimped terminals are secure.
Improper installation and connections may cause excessive heat generation,
fire or an electrical shock.
If the installation platform or frame has corroded, replace it.
A corroded installation platform or frame may cause the unit to fall, resulting in
injury.
Check the earth / grounding, and repair it if the equipment is not properly
earthed / grounded.
Improper earth / grounding may cause an electrical shock.
Be sure to measure insulation resistance after the repair, and make sure
that the resistance is 1 MΩ or higher.
Faulty insulation may cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
Faulty drainage may cause water to enter the room and wet the furniture and
floor.
Do not tilt the unit when removing it.
The water inside the unit may spill and wet the furniture and floor.
SiUS041638E Icons Used
x
2. Icons Used
The following icons are used to attract the attention of the reader to specific information.
Icon Type of
Information
Description
Warning
Warning A Warning is used when there is danger of personal injury.
Caution
Caution A Caution is used when there is danger that the reader, through
incorrect manipulation, may damage equipment, lose data, get
an unexpected result or have to restart (part of) a procedure.
Note:
Note A Note provides information that is not indispensable, but may
nevertheless be valuable to the reader, such as tips and tricks.
Reference A Reference guides the reader to other places in this binder or
in this manual, where he/she will find additional information on a
specific topic.
SiUS041638E Functions
List of Functions 2
1. Functions
Category Functions
FTX30/36NVJU
RK30/36NMVJU
FTX30/36NVJU
RX30/36NMVJU
Category Functions
FTX30/36NVJU
RK30/36NMVJU
FTX30/36NVJU
RX30/36NMVJU
Basic
Functions
Inverter (with inverter power control)
zz
Health &
Cleanliness
Air-purifying filter — —
Operation limit for cooling
Refer to
P. 117
Titanium apatite deodorizing filter
zz
Operation limit for heating Air filter (prefilter)
zz
PAM control
zz
Wipe-clean flat panel
zz
Standby electricity saving
zz
Washable grille — —
Compressor Oval scroll compressor — — MOLD PROOF operation — —
Swing compressor
zz
Timer WEEKLY TIMER
zz
Rotary compressor — — Count up-down ON/OFF timer — —
Reluctance DC motor
zz
24-hour ON/OFF TIMER
zz
Comfortable
Airflow
Power-airflow flap
(horizontal blade) — — NIGHT SET mode
zz
Power-airflow dual flaps
(horizontal blade)
zz
Worry Free
(Reliability &
Durability)
Auto-restart (after power failure)
zz
Self-diagnosis (R/C, LED)
zz
Power-airflow diffuser — — Wiring error check function — —
Wide-angle louvers (vertical blade)
zz
Anti-corrosion treatment of outdoor heat
exchanger
zz
Auto-swing (up and down)
zz
Auto-swing (right and left)
zz
Flexibility
Multi-split/split type compatible indoor
unit
——
3-D airflow
zz
COMFORT AIRFLOW operation
zz
H/P, C/O compatible indoor unit
zz
Comfort
Control
Auto fan speed
zz
Flexible power supply correspondence — —
Indoor unit quiet operation
zz
Chargeless
32.8 ft
(10 m)
32.8 ft
(10 m)
NIGHT QUIET mode (automatic) — —
OUTDOOR UNIT QUIET operation
(manual)
zz
Either side drain (right or left)
zz
Power selection — —
INTELLIGENT EYE operation
zz
Low temperature cooling operation
(–10°C) (14°F)
z
1
z
2
Quick warming function —
z
Hot-start function —
z
°F/°C changeover R/C temperature
display (factory setting: °F)
zz
Automatic defrosting —
z
Operation Automatic operation —
z
Remote
Control
Remote control adaptor
(normal open-pulse contact) (option)
zz
Program dry function
zz
Fan only
zz
Remote control adaptor
(normal open contact) (option)
zz
Lifestyle
Convenience
POWERFUL operation (non-inverter) — —
POWERFUL operation (inverter)
zz
DIII-NET compatible (adaptor) (option)
zz
Priority-room setting — — Remote
Controller
Wireless
zz
COOL/HEAT mode lock — — Wired (option)
zz
HOME LEAVE operation — —
ECONO operation
zz
Indoor unit ON/OFF button
zz
Signal receiving sign
zz
R/C with back light
zz
Temperature display — —
Note: z
: Available
— : Not available
1 Extend operation range to –30°C (
–
22°F) with
an air direction adjustment grille
(sold separately).
2 Extend operation range to –20°C (
–
4°F) with an
air direction adjustment grille (sold separately).
SiUS041638E
3 Specifications
Part 2
Specifications
1. Specifications ..............................................................................................4
1.1 Cooling Only................................................................................................. 4
1.2 Heat Pump ................................................................................................... 5
SiUS041638E Specifications
Specifications 4
1. Specifications
1.1 Cooling Only
60 Hz, 208 - 230 V
Notes:
1. SL: The Quiet fan level of the airflow rate setting.
2. The data are based on the conditions shown in the table below.
Model
Indoor Unit FTX30NVJU FTX36NVJU
Outdoor Unit RK30NMVJU RK36NMVJU
Capacity
Rated Btu/h 31,400 - 31,400 33,200 - 34,400
Min. ~ Max. Btu/h 10,200 - 10,200 ~ 31,400 - 31,400 10,200 - 10,200 ~ 33,200 - 34,400
Running Current (Rated) A 15.7 - 14.2 17 - 17
Power Consumption
Rated W 3,188 - 3,188 3,458 - 3,780
Min. ~ Max. W 610 - 610 ~ 3,188 - 3,188 620 - 620 ~ 3,458 - 3,780
Power Factor (Rated) % 97.6 - 97.6 97.8 - 96.7
COP (Rated) W/W — —
EER (Rated) Btu/W·h 9.85 9.6 - 9.1
SEER / HSPF 17.50 15.90
Piping Connections
Liquid in. (mm) φ 1/4 (φ 6.4) φ 1/4 (φ 6.4)
Gas in. (mm) φ 5/8 (φ 15.9) φ 5/8 (φ 15.9)
Drain in. (mm) φ 5/8 (φ 16.0) φ 5/8 (φ 16.0)
Heat Insulation Both Liquid and Gas Pipes Both Liquid and Gas Pipes
Max. Interunit Piping Length ft (m) 98-3/8 (30) 98-3/8 (30)
Max. Interunit Height Difference ft (m) 65-5/8 (20) 65-5/8 (20)
Chargeless ft (m) 32-13/16 (10) 32-13/16 (10)
Amount of Additional Charge of
Refrigerant
oz/ft
(g/m)
0.32 (30) 0.32 (30)
Indoor Unit FTX30NVJU FTX36NVJU
Front Panel Color White White
Airflow Rate
H
cfm
(m³/min)
890 (25.2) 915 (25.9)
M 727 (20.6) 742 (21.0)
L 572 (16.2) 572 (16.2)
SL 512 (14.5) 512 (14.5)
Fan
Type Cross Flow Fan Cross Flow Fan
Speed Steps 5 Steps, Quiet, Auto 5 Steps, Quiet, Auto
Air Direction Control Right, Left, Horizontal, Downward Right, Left, Horizontal, Downward
Air Filter Removable, Washable, Mildew Proof Removable, Washable, Mildew Proof
Running Current (Rated) A 0.8 - 0.7 0.8 - 0.8
Power Consumption (Rated) W 90.0 - 90.0 95.0 - 95.0
Power Factor (Rated) % 56.2 - 55.9 55.7 - 55.1
Temperature Control Microcomputer Control Microcomputer Control
Dimensions (H × W × D) in. (mm) 13-3/8 × 47-1/4 × 10-3/16 (340 × 1,200 × 259) 13-3/8 × 47-1/4 × 10-3/16 (340 × 1,200 × 259)
Packaged Dimensions (H × W × D) in. (mm) 13-7/16 × 51-9/16 × 16-7/8 (342 × 1,310 × 429) 13-7/16 × 51-9/16 × 16-7/8 (342 × 1,310 × 429)
Weight (Mass) Lbs (kg) 38 (17) 38 (17)
Gross Weight (Gross Mass) Lbs (kg) 49 (22) 49 (22)
Sound Pressure Level H / M / L / SL dB(A) 53 / 47 / 40 / 37 54 / 47 / 40 / 37
Outdoor Unit RK30NMVJU RK36NMVJU
Casing Color Ivory White Ivory White
Compressor
Type Hermetically Sealed Swing Type Hermetically Sealed Swing Type
Model 2YC63AAXD 2YC63AAXD
Motor Output W 1,920 1,920
Refrigerant Oil
Type FVC50K FVC50K
Charge oz (L) 30.44 (0.900) 30.44 (0.900)
Refrigerant
Type R-410A R-410A
Charge Lbs (kg) 3.64 (1.65) 3.64 (1.65)
Airflow Rate
H
cfm
(m³/min)
2,528 (71.6) 2,811 (79.6)
SL — —
Fan Type Propeller Propeller
Running Current (Rated) A 14.93 - 13.50 16.18 - 16.25
Power Consumption (Rated) W 3,098 - 3,098 3,363 - 3,685
Power Factor (Rated) % 99.8 - 99.8 99.9 - 98.6
Starting Current A 15.70 17.00
Dimensions (H × W × D) in. (mm) 28-15/16 × 34-1/4 × 12-5/8 (735 × 870 × 320) 28-15/16 × 34-1/4 × 12-5/8 (735 × 870 × 320)
Packaged Dimensions (H × W × D) in. (mm) 31-7/8 × 41-9/16 × 18-1/4 (810 × 1,056 × 464) 31-7/8 × 41-9/16 × 18-1/4 (810 × 1,056 × 464)
Weight (Mass) Lbs (kg) 133 (60) 133 (60)
Weight (Gross Mass) Lbs (kg) 142 (64) 142 (64)
Sound Pressure Level H dB(A) 56 59
Drawing No. 3D107929 3D107930
Conversion Formulae
kcal/h = kW × 860
Btu/h = kW × 3412
cfm = m³/min × 35.3
Cooling
Indoor ; 80.0°FDB (26.7°CDB) / 67.0°FWB (19.4°CWB)
Outdoor ; 95.0°FDB (35°CDB) / 75°FWB (23.9°CWB)
Heating
Indoor ; 70.0°FDB (21.1°CDB) / 60.0°FWB (15.6°CWB)
Outdoor ; 47°FDB (8.33°CDB) / 43.0°FWB (6.11°CWB)
Piping Length 25 ft (7.5 m)
Specifications SiUS041638E
5 Specifications
1.2 Heat Pump
60 Hz, 208 - 230V
Notes:
1. SL: The Quiet fan level of the airflow rate setting.
2. The data are based on the conditions shown in the table below.
Model
Indoor Unit FTX30NVJU FTX36NVJU
Outdoor Unit
RX30NMVJU RX36NMVJU
Cooling Heating Cooling Heating
Capacity
Rated Btu/h 31,400 - 31,400 34,800 - 34,800 33,200 - 34,400 35,200 - 36,000
Min. ~ Max. Btu/h
10,200 - 10,200 ~ 31,400 -
31,400
10,200 - 10,200 ~ 34,800 -
34,800
10,200 - 10,200 ~ 33,200 -
34,400
10,200 - 10,200 ~ 35,200 -
36,000
Running Current (Rated) A 15.7 - 14.2 17.3 - 15.6 17 - 17 18.1 - 17
Power Consumption
Rated W 3,188 - 3,188 3,490- 3,490 3,458 - 3,780 3,686 - 3,799
Min. ~ Max. W 610 - 610 ~ 3,188 - 3,188 690 - 690 ~ 3,490 - 3,490 620 - 620 ~ 3,458 - 3,780 690 - 690 ~ 3,686 - 3,799
Power Factor (Rated) % 97.6 - 97.6 97.0 - 97.3 97.8 - 96.7 97.9 - 97.2
COP (Rated) W/W — 2.92 — 2.80 - 2.78
EER (Rated)
Btu/W·h
9.85 — 9.6 - 9.1 —
SEER / HSPF 17.50 9.30 15.90 9.20
Piping Connections
Liquid in. (mm) φ 1/4 (φ 6.4) φ 1/4 (φ 6.4)
Gas in. (mm) φ 5/8 (φ 15.9) φ 5/8 (φ 15.9)
Drain in. (mm) φ 5/8 (φ 16.0) φ 5/8 (φ 16.0)
Heat Insulation Both Liquid and Gas Pipes Both Liquid and Gas Pipes
Max. Interunit Piping Length ft (m) 98-3/8 (30) 98-3/8 (30)
Max. Interunit Height Difference ft (m) 65-5/8 (20) 65-5/8 (20)
Chargeless ft (m) 32-13/16 (10) 32-13/16 (10)
Amount of Additional Charge of
Refrigerant
oz/ft
(g/m)
0.32 (30) 0.32 (30)
Indoor Unit FTX30NVJU FTX36NVJU
Front Panel Color White White
Airflow Rate
H
cfm
(m³/min)
890 (25.2) 960 (27.2) 915 (25.9) 960 (27.2)
M 727 (20.6) 791 (22.4) 742 (21.0) 791 (22.4)
L 572 (16.2) 629 (17.8) 572 (16.2) 629 (17.8)
SL 512 (14.5) 544 (15.4) 512 (14.5) 544 (15.4)
Fan
Type Cross Flow Fan Cross Flow Fan
Speed Steps 5 Steps, Quiet, Auto 5 Steps, Quiet, Auto
Air Direction Control Right, Left, Horizontal, Downward Right, Left, Horizontal, Downward
Air Filter Removable, Washable, Mildew Proof Removable, Washable, Mildew Proof
Running Current (Rated) A 0.77 - 0.70 0.82 - 0.75 0.82 - 0.75 0.82 - 0.75
Power Consumption (Rated) W 90.0 - 90.0 95.0 - 95.0 95.0 - 95.0 95 - 95
Power Factor (Rated) % 56.2 - 55.9 55.7 - 55.1 55.7- 55.1 55.7 - 55.1
Temperature Control Microcomputer Control Microcomputer Control
Dimensions (H × W × D) in. (mm) 13-3/8 × 47-1/4 × 10-3/16 (340 × 1,200 × 259) 13-3/8 × 47-1/4 × 10-3/16 (340 × 1,200 × 259)
Packaged Dimensions (H × W × D) in. (mm) 13-7/16 × 51-9/16 × 16-7/8 (342 × 1,310 × 429) 13-7/16 × 51-9/16 × 16-7/8 (342 × 1,310 × 429)
Weight (Mass) Lbs (kg) 38 (17) 38 (17)
Gross Weight (Gross Mass) Lbs (kg) 49 (22) 49 (22)
Sound Pressure Level H / M / L / SL dB(A) 53 / 47 / 40 / 37 53 / 46 / 38 / 35 54 / 47 / 40 / 37 53 / 46 / 38 / 35
Outdoor Unit RX30NMVJU RX36NMVJU
Casing Color Ivory White Ivory White
Compressor
Type Hermetically Sealed Swing Type Hermetically Sealed Swing Type
Model 2YC63AAXD 2YC63AAXD
Motor Output W 1,920 1,920
Refrigerant Oil
Type FVC50K FVC50K
Charge oz (L) 30.44 (0.900) 30.44 (0.900)
Refrigerant
Type R-410A R-410A
Charge Lbs (kg) 3.64 (1.65) 3.64 (1.65)
Airflow Rate
H
cfm
(m³/min)
2,528 (71.6) 2,274 (64.4) 2,811 (79.6) 2,352 (66.6)
SL ————
Fan
Type
Propeller Propeller
Running Current (Rated) A 14.93 - 13.50 16.48 - 14.85 16.18 - 16.25 17.28 - 16.25
Power Consumption (Rated) W 3,098 - 3,098 3,395 - 3,395 3,363 - 3,685 3,591 - 3,704
Power Factor (Rated) % 99.8 - 99.8 99.0 - 99.4 99.9 - 98.6 99.9 - 99.1
Starting Current A 17.30 18.10
Dimensions (H × W × D) in. (mm) 28-15/16 × 34-1/4 × 12-5/8 (735 × 870 × 320) 28-15/16 × 34-1/4 × 12-5/8 (735 × 870 × 320)
Packaged Dimensions (H × W × D) in. (mm) 31-7/8 × 41-9/16 × 18-1/4 (810 × 1,056 × 464) 31-7/8 × 41-9/16 × 18-1/4 (810 × 1,056 × 464)
Weight (Mass) Lbs (kg) 133 (60) 133 (60)
Gross Weight (Gross Mass) Lbs (kg) 142 (64) 142 (64)
Sound Pressure Level H dB(A) 56 58 59 59
Drawing No. 3D107927 3D107928
Conversion Formulae
kcal/h = kW × 860
Btu/h = kW × 3412
cfm = m³/min × 35.3
Cooling
Indoor ; 80.0°FDB (26.7°CDB) / 67.0°FWB (19.4°CWB)
Outdoor ; 95.0°FDB (35°CDB) / 75°FWB (23.9°CWB)
Heating
Indoor ; 70.0°FDB (21.1°CDB) / 60.0°FWB (15.6°CWB)
Outdoor ; 47°FDB (8.33°CDB) / 43.0°FWB (6.11°CWB)
Piping Length 25 ft (7.5 m)
SiUS041638E
Printed Circuit Board Connector Wiring Diagram 6
Part 3
Printed Circuit Board
Connector Wiring Diagram
1. Indoor Unit...................................................................................................7
1.1 FTX30/36NVJU ............................................................................................ 7
2. Outdoor Unit................................................................................................9
2.1 RK(X)30/36NMVJU ...................................................................................... 9
Indoor Unit SiUS041638E
7 Printed Circuit Board Connector Wiring Diagram
1. Indoor Unit
1.1 FTX30/36NVJU
Control PCB
(PCB1)
Caution Replace the PCB if you accidentally cut a wrong jumper.
Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them.
Note: The symbols in the parenthesis are the names on the appropriate wiring diagram.
1) S1 Connector for DC fan motor
2) S21 Connector for centralized control (HA)
3) S25 Connector for INTELLIGENT EYE sensor PCB (PCB4)
4) S32 Indoor heat exchanger thermistor
5) S41 Connector for swing motors
6) S46 Connector for display PCB (PCB3)
7) S47 Connector for signal receiver PCB (PCB2)
8) H1, H2, H3, FG Connector for terminal strip
9) JA Address setting jumper
∗ Refer to page 108 for details.
10)JB Fan speed setting when compressor stops for thermostat OFF
(effective only for cooling operation)
∗ Refer to page 108 for details.
11)JC Power failure recovery function (auto-restart)
∗ Refer to page 108 for details.
12)LED A LED for service monitor (green)
13)FU1 (F1U),
FU2 (F2U)
Fuse (3.15 A, 250 V)
14)V1 Varistor
2P227881-8
FU1
V1
H1
H2FGH3
LED A
S32
S1S41
S46
S25
S47
S21
JB
JA
JC
FU2
SiUS041638E Indoor Unit
Printed Circuit Board Connector Wiring Diagram 8
Signal Receiver
PCB (PCB2)
Display PCB
(PCB3)
INTELLIGENT
EYE Sensor PCB
(PCB4)
Note: The symbols in the parenthesis are the names on the appropriate wiring diagram.
1) S48 Connector for control PCB (PCB1)
3P224121-1
S48
1) S49 Connector for control PCB (PCB1)
2) SW1 Indoor unit ON/OFF button
3) LED1 (H1P) LED for operation (green)
4) LED2 (H2P) LED for timer (yellow)
5) LED3 (H3P) LED for INTELLIGENT EYE (green)
6) RTH1 (R1T) Room temperature thermistor
3P224121-1
RTH1 SW1
LED3 LED2 LED1
S49
1) S36 Connector for control PCB (PCB1)
S36
3P227885-1
Outdoor Unit SiUS041638E
9 Printed Circuit Board Connector Wiring Diagram
2. Outdoor Unit
2.1 RK(X)30/36NMVJU
Main PCB
(PCB1)
1) S Connector for terminal block (indoor - outdoor transmission)
2) S20 (white) Connector for electronic expansion valve coil
3) S40 Connector for overload protector
4) S70 Connector for DC fan motor
5) S80 Connector for four way valve coil (heat pump models only)
6) S90 Connector for thermistors
(outdoor temperature, outdoor heat exchanger, discharge pipe)
7) S201, S202 Connector for service monitor PCB (PCB2)
8) CK1 Connector for voltage endurance test
9) HL1, HN1 Connector for terminal block (power supply)
10) E1, E2 Connector for ground wire
11) U, V, W Connector for compressor
12) FU1, FU2 Fuse (3.15 A, 250 V)
13) FU3 Fuse (30 A, 250 V)
14) V2, V3, V401 Varistor
SiUS041638E Outdoor Unit
Printed Circuit Board Connector Wiring Diagram 10
V401
E1, E2
FU1 V3
V2
FU3
HN1
HL1
CK1
S20
S90
S201
S
S70
S202
U, V, W
FU2
S80 S40
2P455785-13
Outdoor Unit SiUS041638E
11 Printed Circuit Board Connector Wiring Diagram
Service Monitor
PCB (PCB2)
SW1 ~ SW4 and LED1 ~ LED5 do not work.
1) S501, S502 Connector for main PCB (PCB1)
2) LED A LED for service monitor (green)
3) SW5-3 Switch for facility setting
∗ Refer to page 109 for details.
4) SW6-2 Switch for facility setting
∗ Refer to page 109 for details.
3P346711-10
S502SW6-2SW5-3
LED A S501
SiUS041638E
Functions and Control 12
Part 4
Functions and Control
1. Main Functions..........................................................................................13
1.1 Temperature Control .................................................................................. 13
1.2 Frequency Principle.................................................................................... 13
1.3 Airflow Direction Control............................................................................. 15
1.4 Fan Speed Control for Indoor Unit ............................................................. 16
1.5 Program Dry Operation .............................................................................. 17
1.6 Automatic Operation................................................................................... 18
1.7 Thermostat Control..................................................................................... 19
1.8 NIGHT SET Mode ...................................................................................... 20
1.9 ECONO Operation ..................................................................................... 20
1.10 INTELLIGENT EYE Operation ................................................................... 21
1.11 POWERFUL Operation .............................................................................. 22
1.12 Clock Setting .............................................................................................. 23
1.13 WEEKLY TIMER Operation ....................................................................... 24
1.14 Other Functions.......................................................................................... 30
2. Thermistor Functions ................................................................................31
3. Control Specification .................................................................................33
3.1 Mode Hierarchy .......................................................................................... 33
3.2 Frequency Control...................................................................................... 34
3.3 Controls at Mode Changing/Start-up.......................................................... 36
3.4 Discharge Pipe Temperature Control......................................................... 38
3.5 Input Current Control.................................................................................. 39
3.6 Freeze-up Protection Control ..................................................................... 40
3.7 Heating Peak-cut Control ........................................................................... 40
3.8 Outdoor Fan Control................................................................................... 41
3.9 Liquid Compression Protection Function.................................................... 41
3.10 Defrost Control ........................................................................................... 42
3.11 Electronic Expansion Valve Control ........................................................... 43
3.12 Malfunctions ............................................................................................... 46
Main Functions SiUS041638E
13 Functions and Control
1. Main Functions
1.1 Temperature Control
Definitions of
Temperatures
The definitions of temperatures are classified as following.
Room temperature: temperature of lower part of the room
Set temperature: temperature set by remote controller
Room thermistor temperature: temperature detected by room temperature thermistor
Target temperature: temperature determined by microcomputer
Temperature
Control
The temperature of the room is detected by the room temperature thermistor. However, there is a
difference between the temperature detected by room temperature thermistor and the temperature
of lower part of the room, depending on the type of the indoor unit or installation condition.
Practically, the temperature control is done by the target temperature appropriately adjusted for the
indoor unit and the temperature detected by room temperature thermistor.
1.2 Frequency Principle
Control
Parameters
The frequency of the compressor is controlled by the following 2 parameters:
The load condition of the operating indoor unit
The difference between the room thermistor temperature and the target temperature
The target frequency is adapted by additional parameters in the following cases:
Frequency restrictions
Initial settings
Forced cooling operation
Inverter Principle To regulate the capacity, a frequency control is needed. The inverter makes it possible to control
the rotation speed of the compressor. The following table explains the inverter principle:
Target temperature
Set temperature
Room temperature
Room thermistor temperature
(R12321)
Phase Description
1 The supplied AC power source is converted into the DC power source for the present.
2 The DC power source is reconverted into the three phase AC power source with variable
frequency.
When the frequency increases, the rotation speed of the compressor increases resulting
in an increase of refrigerant circulation. This leads to a larger amount of heat exchange
per unit.
When the frequency decreases, the rotation speed of the compressor decreases
resulting in a decrease of refrigerant circulation. This leads to a smaller amount of heat
exchange per unit.
SiUS041638E Main Functions
Functions and Control 14
The following drawing shows a schematic view of the inverter principle:
Inverter Features The inverter provides the following features:
The regulating capacity can be changed according to the changes in the outdoor temperature
and cooling/heating load.
Quick heating and quick cooling
The rotation speed of the compressor is increased when starting the heating (or cooling). This
enables to reach the set temperature quickly.
Even during extreme cold weather, high capacity is achieved. It is maintained even when the
outdoor temperature is 2°C (35.6 °F).
Comfortable air conditioning
A fine adjustment is integrated to keep the room temperature constant.
Energy saving heating and cooling
Once the set temperature is reached, the energy saving operation enables to maintain the room
temperature at low power.
Frequency Limits The following functions regulate the minimum and maximum frequency:
Forced Cooling
Operation
Refer to page 105 for details.
Refrigerant circulation rate (high)
high f
low f
freq=variable
Refrigerant circulation rate (low)
high speed
low speed
(R2812)
Amount of heat
exchanged air (large)
freq=
constant
50 Hz
60 Hz
capacity=
variable
Amount of heat
exchanged air (small)
AC
power
DC
power
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
Frequency Functions
Low Four way valve operation compensation. Refer to page 36.
High Compressor protection function. Refer to page 37.
Discharge pipe temperature control. Refer to page 38.
Input current control. Refer to page 39.
Freeze-up protection control. Refer to page 40.
Heating peak-cut control. Refer to page 40.
Defrost control. Refer to page 42.
Main Functions SiUS041638E
15 Functions and Control
1.3 Airflow Direction Control
Power-Airflow
Dual Flaps
The large flap sends a large volume of air downward to the floor and provides an optimum control in
cooling, dry, and heating operation.
Cooling/Dry
During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far
and distributed all over the room.
Heating
During heating operation, the large flap directs airflow downward to spread the warm air to the
entire room.
Wide-Angle
Louvers
The louvers, made of elastic synthetic resin, provide a wide range of airflow that guarantees
comfortable air distribution.
Auto-Swing The following table explains the auto-swing process for cooling, dry, heating, and fan:
3-D Airflow Alternative repetition of vertical and horizontal swing motions enables uniform air-conditioning of
the entire room.
When the horizontal swing and vertical swing are both set to automatic operation, the airflow
becomes 3-D airflow. The horizontal and vertical swing motions are alternated and the airflow
direction changes in the order shown in the following diagram.
(1) The louvers move from the right to the left.
(2) The flaps move downward.
(3) The louvers move from the left to the right.
(4) The flaps move upward.
COMFORT
AIRFLOW
Operation
The airflow direction is upward while in cooling and dry operation, and downward while in heating
operation. This function prevents cold or warm air from blowing directly on the occupants in the
room.
When COMFORT AIRFLOW operation is set, or the combination use of COMFORT AIRFLOW
operation and INTELLIGENT EYE operation is set, the airflow rate will be set to AUTO.
If the up and down airflow direction is selected, COMFORT AIRFLOW operation will be canceled.
Priority is given to the function of whichever button is pressed last.
Flap (up and down)
Louver
(right and left)
Cooling/Dry Heating Fan
(R9303)
60˚
50˚
25˚
15˚
(R9304)
70˚
40˚
75˚
30˚
(R9305)
75˚
15˚
25˚
70˚
(R9306)
45
˚
45
˚
(R19554)
(2)
(4)
(3)
(1)
SiUS041638E Main Functions
Functions and Control 16
1.4 Fan Speed Control for Indoor Unit
Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH.
The airflow rate can be automatically controlled depending on the difference between the room
thermistor temperature and the target temperature.
Automatic Fan
Speed Control
In automatic fan speed operation, the step SL is not available.
= The airflow rate is automatically controlled within this range when FAN button is set to
automatic
.
Cooling
The following drawing explains the principle of fan speed control for cooling.
*The upper limit is M tap in 30 minutes from the operation start.
Heating
In heating operation, the fan speed is regulated according to the indoor heat exchanger
temperature and the difference between the room thermistor temperature and the target
temperature.
Note: The fan stops during defrost control.
COMFORT
AIRFLOW
Operation
The fan speed is controlled automatically within the following steps.
Cooling
L tap ~ MH tap (same as automatic)
Heating
LL tap ~ M tap
Step Cooling Heating
LLL
LL
L
ML
M
MH
H
HH (POWERFUL)
(R11681)
(R6834)
(R21654)
Fan speed
+2.5°C (+4.5°F)
+1.5°C (+2.7°F)
+0.5°C (+0.9°F)
MH*
M
ML
L
+3°C (+5.4°F)
+2°C (+3.6°F)
+1°C (+1.8°F)
Room thermistor temperature – target temperature
Main Functions SiUS041638E
17 Functions and Control
1.5 Program Dry Operation
Outline Program dry operation removes humidity while preventing the room temperature from lowering.
Since the microcomputer controls both the temperature and airflow rate, the temperature
adjustment and FAN setting buttons are inoperable.
Details The microcomputer automatically sets the temperature and airflow rate. The difference between
the room thermistor temperature at start-up and the target temperature is divided into two zones.
Then, the unit operates in an appropriate capacity for each zone to maintain the temperature and
humidity at a comfortable level.
Thermostat turns on also when the room temperature is in the zone B for 10 minutes.
Room thermistor
temperature at start-up
Target temperature
X
Thermostat OFF point
Y
Thermostat ON point
Z
24°C or more
(75.2°F or more)
Room thermistor
temperature at start-up
X – 2.5°C
(X – 4.5°F)
X – 0.5°C
(X – 0.9°F)
18 ~ 23.5°C
(64.4 ~ 74.3°F)
X – 2.0°C
(X – 3.6°F)
X – 0.5°C
(X – 0.9°F)
17.5°C or less
(63.5°F or less)
18°C
(64.4°F)
X – 2.0°C
(X – 3.6°F)
X – 0.5°C = 17.5°C
(X – 0.9°F = 63.5°F)
Zone A = Thermostat OFF
Target temperature X
Zone B
Room temperature Room temperature
Zone C = Thermostat ON
Y = X – 2.5°C (4.5°F)
or
Y = X – 2.0°C (3.6°F)
Z = X – 0.5°C (0.9°F)
X – 1.0°C (1.8°F)
(R24029)
SiUS041638E Main Functions
Functions and Control 18
1.6 Automatic Operation
Outline Automatic Cooling/Heating Function
When the automatic operation is selected with the remote controller, the microcomputer
automatically determines the operation mode as cooling or heating according to the room
temperature and the set temperature at start-up.
The unit automatically switches the operation mode to maintain the room temperature at the set
temperature.
Details Ts: set temperature (set by remote controller)
Tt: target temperature (determined by microcomputer)
Tr: room thermistor temperature (detected by room temperature thermistor)
C: correction value
1. The set temperature (Ts) determines the target temperature (Tt).
(Ts = 18 ~ 30°C, 64 ~ 86°F).
2. The target temperature (Tt) is calculated as:
Tt = Ts + C
where C is the correction value
.
C = 0°C (0°F)
3. Thermostat ON/OFF point and operation mode switching point are as follows.
Tr means the room thermistor temperature.
(1) Heating → Cooling switching point:
Tr ≥ Tt + 3.0°C (+5.4°F)
(2) Cooling → Heating switching point:
Tr < Tt – 2.5°C (–4.5°F)
(3) Thermostat ON/OFF point is the same as the ON/OFF point of cooling or heating operation.
4. During initial operation
Tr ≥ Ts : Cooling operation
Tr < Ts : Heating operation
Ex: When the target temperature is 25°C (77°F)
Cooling → 23°C (73.4°F): Thermostat OFF → 22°C (71.6°F): Switch to heating
Heating → 27°C (80.6°F): Thermostat OFF → 28°C (82.4°F): Switch to cooling
Target temperature + 3.0˚C (+5.4˚F)
Heating Operation
Target temperature – 3.0˚C (–5.4˚F)
Cooling Operation
(R24627)
Target temperature – 2.0˚C (–3.6˚F)
= Thermostat OFF
Target temperature + 2.0˚C (+3.6˚F)
= Thermostat OFF
Main Functions SiUS041638E
19 Functions and Control
1.7 Thermostat Control
Outline Thermostat control is based on the difference between the room thermistor temperature and the
target temperature.
Details Thermostat OFF Condition
The temperature difference is in the zone A.
Thermostat ON Conditions
The temperature difference returns to the zone C after being in the zone A.
The system resumes from defrost control in any zones except A.
The operation turns on in any zones except A.
The temperature difference remains in zone B for the determined monitoring time.
(Cooling: 10 minutes, Heating: 10 seconds)
Cooling
Heating
Refer to Temperature Control on page 13 for details.
Zone B
Zone A
OFF
ON
Zone C
Room thermistor temperature – target temperature
–1.0˚C (–1.8˚F)
–2.0˚C (–3.6˚F)
(R24628)
–0.5˚C (–0.9˚F)
–1.5˚C (–2.7˚F)
Zone B
Zone B
Zone A
Zone A
OFF
OFF
ON
ON
Zone C
Zone C
2.0˚C (3.6˚F)
0.5˚C (0.9˚F)
1.5˚C (2.7˚F)
Room thermistor temperature – target temperature
(R24629)
SiUS041638E Main Functions
Functions and Control 20
1.8 NIGHT SET Mode
Outline When the OFF TIMER is set, NIGHT SET Mode is automatically activated. NIGHT SET Mode
keeps the airflow rate setting.
Details NIGHT SET Mode continues operation at the target temperature for the first one hour, then
automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the
case of heating. This prevents excessive cooling in summer and excessive heating in winter to
ensure comfortable sleeping conditions, and also conserves electricity.
Cooling
Heating
1.9 ECONO Operation
Outline ECONO operation reduces the maximum power consumption. This operation is particularly
convenient for energy-saving. It is also a major bonus when breaker capacity does not allow the
use of multiple electrical devices and air conditioners.
It can be easily activated by pressing ECONO button on the wireless remote controller.
Details
When this function is activated, the maximum capacity also decreases.
The remote controller can send the ECONO command when the unit is in cooling, heating, dry,
or automatic operation. This function can only be set when the unit is running. Press ON/OFF
button on the remote controller to cancel the function.
This function and POWERFUL operation cannot be used at the same time. The latest command
has the priority.
(R23917)
Target temperature
+0.5˚C (+0.9˚F)
temperature shift
Operation stops
at the set hour
0.5˚C (0.9˚F)
1 hour
TIMER operation
NIGHT SET Mode ON
Target temperature
–2˚C (–3.6˚F)
temperature shift
1 hour
2˚C (3.6˚F)
(R23918)
TIMER operation
NIGHT SET Mode ON
ECONO operation
(R21051)
Normal operation
Maximum during normal operation
Maximum during ECONO operation
Time
Power
consumption
Main Functions SiUS041638E
21 Functions and Control
1.10 INTELLIGENT EYE Operation
Outline This function detects the presence of humans in the room with a motion sensor and reduces the
capacity when there is nobody in the room in order to save electricity.
Details 1. INTELLIGENT EYE detection method
The motion sensor detects human motion by receiving infrared rays and sends the pulse wave
output.
The microcomputer in the indoor unit carries out a sampling every 20 msec. If the motion sensor
detects 10 times or more of the wave output in one second in total, and the High signal
continues for 3 sec., the microcomputer judges humans are in the room as the human detection
signal is ON.
2. Motions (in cooling)
In FAN operation, the fan speed is reduced by 60 rpm when no one is in the area.
When there is no signal from the motion sensor in 20 minutes, the microcomputer judges that
nobody is in the room and operates the unit at a temperature shifted from the target
temperature. (Cooling/Dry: 1 ~ 2°C (1.8 ~ 3.6°F) higher, Heating: 2°C (3.6°F) lower, Auto:
according to the operation mode at that time.)
Note: For dry operation, the target temperature is shifted internally. The temperature cannot be set with
the remote controller.
1 sec.
Sampling (20 msec.)
High
Low
ON
OFF
High
Low
(R24035)
(Condition of 10 times or more output)
Human motion
3 sec.
If the detection signal (High) continues for 3 sec. or more,
the microcomputer judges humans are in the room.
Detection signal
from the motion
sensor
Human detection
signal
Motion sensor
output
If the motion sensor detects the outputs
10 times/sec. or more, the microcomputer
judges the detection signal from the
motion sensor is High.
ON
OFF
Reset Reset Reset
20 min.
1 ~ 2˚C (1.8 ~ 3.6 ˚F)
ON
OFF
ON
OFF
Operation
OFF
Fan speed (+)
Set speed Set speed
Target temperature
(R23920)
Remote controller
Sensor button
Human detection
signal
↑↑
60 rpm
↑
within
20 min.
within
20 min.
within
20 min.
SiUS041638E Main Functions
Functions and Control 22
1.11 POWERFUL Operation
Outline In order to exploit the cooling and heating capacity to full extent, the air conditioner can be operated
by increasing the indoor fan rotating speed and the compressor frequency.
Details When POWERFUL button is pressed, the fan speed and target temperature are converted to the
following states for 20 minutes.
A
= 0 ~ 50 rpm (depending on the operating mode)
Ex: POWERFUL operation in cooling
Note: POWERFUL operation cannot be used together with ECONO, COMFORT AIRFLOW or
OUTDOOR UNIT QUIET operation.
Operation mode Fan speed Target temperature
COOL H tap + A rpm 18°C (64.4°F)
DRY Dry rotating speed + A rpm Lowered by 2.5°C (4.5°F)
HEAT H tap + A rpm 31.5°C (88.7°F)
FAN H tap + A rpm —
AUTO Same as cooling/heating in
POWERFUL operation
The target temperature is
kept unchanged.
(R24528)
Target temp.
Fan
A rpm
H tap
Set tap
20 minutes
Lower limit of cooling
temperature
Remote controller registers
20 minutes independently.
POWERFUL
ON
POWERFUL
OFF
Ending condition:
1. Lapse of 20 minutes
2. System operation OFF
3. POWERFUL operation OFF
18˚C (64.4˚F)
Main Functions SiUS041638E
23 Functions and Control
1.12 Clock Setting
ARC466 Series The clock can be set by taking the following steps:
1. Press Clock button.
→ is displayed and MON and blink.
2. Press Select or Select button to set the clock to the current day of the week.
3. Press Clock button.
→ blinks.
4. Press Select or Select button to set the clock to the present time.
Holding down Select or Select button rapidly increases or decreases the displayed time.
5. Press Clock button. (Point the remote controller at the indoor unit when pressing the button.)
→ blinks and clock setting is completed.
(R24529)
0:00
Select
button
Clock
button
ARC466 series
SiUS041638E Main Functions
Functions and Control 24
1.13 WEEKLY TIMER Operation
Outline Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total).
The 3 items: ON/OFF, temperature, and time can be set.
Details
ON ON
OFF
OFF
ON
ON
OFF
OFF
Setting example of the WEEKLY TIMER
The same timer settings are used from Monday through Friday, while different timer settings are used for the weekend.
[Monday]
Make timer settings for programs 1-4.
6:00 8:30 17:30 22:00
77˚F (25˚C) 81˚F (27˚C)
program 1 program 2 program 3 program 4
ON OFF ON OFF
6:00 8:30 17:30 22:00
77˚F (25˚C) 81˚F (27˚C)
program 1 program 2 program 3 program 4
ON OFF ON OFF
[Saturday] No timer settings
[Sunday]
Make timer settings for programs 1-4.
8:00 10:00 19:00 21:00
81˚F (27˚C)
81˚F (27˚C)
77˚F (25˚C)
ON OFF OFF ON
program 1 program 2 program 3 program 4
[Tuesday]
to
[Friday]
Use the copy mode to make settings for Tuesday to Friday, because these settings are the same as
those for Monday.
• Up to 4 reservations per day and 28 reservations per week can be set using the WEEKLY TIMER. The effective use of the
copy mode simplifies timer programming.
• The use of ON-ON-ON-ON settings, for example, makes it possible to schedule operating mode and set temperature
changes. Furthermore, by using OFF-OFF-OFF-OFF settings, only the turn off time of each day can be set. This will turn off
the air conditioner automatically if you forget to turn it off.
Main Functions SiUS041638E
25 Functions and Control
To use WEEKLY TIMER operation
Setting mode
• Make sure the day of the week and time are set.
If not, set the day of the week and time.
6:00 8:30 17:30 22:00
77˚F (25˚C)
81˚F (27˚C)
program 1 program 2 program 3 program 4
ON OFF ON OFF
[Monday]
Setting Displays
Day and number ON/OFF Time Temperature
1.
Press .
• The day of the week and the reservation number of the current day will be displayed.
• 1 to 4 settings can be made per day.
• Pressing changes the reservation number and the day of the week.
3.
Press .
• The day of the week and reservation number will be set.
• “ ” and “ ” blink.
4.
Press to select the desired mode.
• Pressing changes the “ ” or “ ” setting in sequence.
ON TIMER OFF TIMER
blank
No Setting
Pressing puts the sequence in reverse.
5.
Press .
2.
Press to select the desired day of the week
and reservation number.
• In case the reservation has already been set, selecting “ blank ” deletes the reservation.
• Proceed to STEP
9
if “ blank ” is selected.
• To return to the day of the week and reservation number setting, press .
• The ON/OFF TIMER mode will be set.
• “ ” and the time blink.
SiUS041638E Main Functions
Functions and Control 26
6.
Press to select the desired time.
7.
Press .
8.
Press to select the desired temperature.
9.
Press .
10
.
Press to complete the setting.
NOTE
• The time can be set between 0:00 and 23:50 in 10-minute intervals.
• To return to the ON/OFF TIMER mode setting, press .
• Proceed to STEP
9
when setting the OFF TIMER.
• The time will be set.
• “ ” and the temperature blink.
• The temperature can be set between 50˚F (10˚C) and 90˚F (32˚C).
COOL or AUTO: The unit operates at 64˚F (18˚C) even if it is set at 50˚F (10˚C) to 63˚F (17˚C).
HEAT or AUTO : The unit operates at 86˚F (30˚C) even if it is set at 87˚F (31˚C) to 90˚F (32˚C).
• To return to the time setting, press .
• The set temperature is only displayed when the mode setting is on.
• Check for a receiving tone and that the OPERATION lamp blinks twice.
• The TIMER lamp lights orange.
• Temperature and time are set in the case of ON TIMER operation, and the time is set in
the case of OFF TIMER operation.
• The next reservation screen will appear.
• To continue further settings, repeat the procedure from STEP
4
.
• “ ” is displayed on the LCD and WEEKLY TIMER operation is activated.
• A reservation made once can be easily copied and the same settings used for another
day of the week. Refer to Copy mode .
Notes on WEEKLY TIMER operation
• Do not forget to set the clock on the remote controller first.
• The day of the week, ON/OFF TIMER mode, time and set temperature (only for ON TIMER mode) can be set with the WEEKLY TIMER. When
set to ON TIMER mode, operation will begin in the settings used previously for operation mode, temperature, airflow rate, and airflow direction.
• WEEKLY TIMER and ON/OFF TIMER operation cannot be used at the same time. The ON/OFF TIMER operation has priority if it is set while
WEEKLY TIMER is still active. The WEEKLY TIMER will enter the standby state, and “ ” will disappear from the LCD. When the ON/
OFF TIMER is up, the WEEKLY TIMER will automatically become active.
• Turning off the circuit breaker, power failure, and other similar events will render operation of the indoor unit’s internal clock inaccurate. Reset
the clock.
• can be used only for the time and temperature settings. It cannot be used to go back to the reservation number.
Display
Main Functions SiUS041638E
27 Functions and Control
Copy mode
6:00 8:30 17:30 22:00
77˚F (25˚C)
81˚F (27˚C)
6:00 8:30 17:30 22:00
77˚F (25˚C)
81˚F (27˚C)
COPY
program 1 program 2 program 3 program 4
ON OFF ON OFF
[Monday]
program 1 program 2 program 3 program 4
ON OFF ON OFF
Setting Displays
Confirmation Copy Paste Normal
1.
Press .
2.
Press to confirm the day of the week to be copied.
3.
Press .
4.
Press to select the destination day of the week.
5.
Press .
6.
Press to complete the setting.
NOTE
[Tuesday]
to
[Friday]
• A reservation made once can be copied to another day of the week. The whole reservation of
the selected day of the week will be copied.
• The whole reservation of the selected day of the week will be copied.
• Check for a receiving tone and that the OPERATION lamp blinks twice.
• The reservation will be copied to the selected day of the week. The whole reservation of
the selected day of the week will be copied.
• To continue copying the settings to other days of the week, repeat STEP
4
and STEP
5
.
• “ ” is displayed on the LCD and WEEKLY TIMER operation is activated.
Note on COPY MODE
• The entire reservation of the source day of the week is copied in the copy mode.
In the case of making a reservation change for any day of the week individually after copying the content of weekly reservations, press and
change the settings in the steps of
Setting mode .
SiUS041638E Main Functions
Functions and Control 28
Confirming a reservation
Setting Displays
Normal Confirmation
1.
Press .
3.
Press to exit the confirmation mode.
To deactivate WEEKLY TIMER operation
NOTE
2.
• The reservation can be confirmed.
• The day of the week and the reservation number of the current day will be displayed.
• Pressing displays the reservation details.
•
To change the confirmed reserved settings, select the reservation number and press .
The mode is switched to setting mode. Proceed to Setting mode STEP
4
.
• “ ” is displayed on the LCD and WEEKLY TIMER operation is activated.
• “ ” disappears from the LCD.
• The TIMER lamp goes off.
• To reactivate the WEEKLY TIMER operation, press again.
• If a reservation deactivated with is activated once again, the last reservation mode
will be used.
Press to select the day of the week and the
reservation number to be confirmed.
Press while “
” is displayed on the
LCD.
• If not all the reservation settings are reflected, deactivate the WEEKLY TIMER operation once. Then press again to reactivate the
WEEKLY TIMER operation.
Main Functions SiUS041638E
29 Functions and Control
To delete reservations
An individual reservation
1.
Press .
• The day of the week and the reservation number will be displayed.
3.
Press .
4.
Press until no icon is displayed.
ON TIMER OFF TIMER
blank
No Setting
Pressing puts the sequence in reverse.
5.
Press .
6.
Press .
• If there are still other reservations, WEEKLY TIMER operation will be activated.
Reservations for each day of the week
1.
Press .
• The day of the week and the reservation number will be displayed.
2.
Press to select the day of the week to be deleted.
3.
Hold for about 5 seconds.
4.
Press .
• If there are still other reservations, WEEKLY TIMER operation will be activated.
All reservations
Hold for about 5 seconds with the normal display.
2.
Press to select the day of the week and the
reservation number to be deleted.
• “ ” and “ ” or “ ” blink.
• Pressing changes the ON/OFF TIMER mode in sequence.
• Selecting “blank” will cancel any reservation you may have.
• This function can be used for deleting reservations for each day of the week.
• It can be used while confirming or setting reservations.
• Check for a receiving tone and that the OPERATION lamp blinks twice.
• “ ” disappears from the LCD.
• The TIMER lamp goes off.
• All reservations will be deleted.
• This operation is not functional while the WEEKLY TIMER setting screen is displayed.
• The selected reservation will be deleted.
• Check for a receiving tone and that the OPERATION lamp blinks twice.
• Check for a receiving tone and that the OPERATION lamp blinks twice.
• The reservation of the selected day of the week will be deleted.
SiUS041638E Main Functions
Functions and Control 30
1.14 Other Functions
1.14.1 Hot-Start Function
In order to prevent the cold air blast that normally occurs when heating operation starts, the
temperature of the indoor heat exchanger is detected, and the airflow is either stopped or
significantly weakened resulting in comfortable heating.
Note: The cold air blast is prevented using similar control when defrost control starts or when the
thermostat is turned ON.
1.14.2 Signal Receiving Sign
When the indoor unit receives a signal from the remote controller, the unit emits a signal receiving
sound and the operation lamp blinks.
1.14.3 Indoor Unit ON/OFF Button
ON/OFF button is provided on the display of the unit.
Press ON/OFF button once to start operation. Press once again to stop it.
ON/OFF button is useful when the remote controller is missing or the battery has run out.
Forced cooling operation
Forced cooling operation can be started by pressing ON/OFF button for 5 to 9 seconds while the
unit is not operating. Forced cooling operation is not started if ON/OFF button is pressed for 10
seconds or more.
Refer to page 105 for details.
1.14.4 Auto-restart Function
If a power failure (even a momentary one) occurs during the operation, the system restarts
automatically in the same conditions as before when the power supply is restored to the conditions
prior to the power failure.
Note: It takes 3 minutes to restart the operation because the 3-minute standby function is activated.
Mode Temperature setting Airflow rate
Cooling Only COOL 22°C (72°F) Automatic
Heat Pump AUTO 25°C (77°F) Automatic
ON/OFF button
(R20396)
Thermistor Functions SiUS041638E
31 Functions and Control
2. Thermistor Functions
(1) Discharge
Pipe Thermistor
The discharge pipe thermistor is used for controlling discharge pipe temperature. If the
discharge pipe temperature (used in place of the inner temperature of the compressor) rises
abnormally, the operating frequency becomes lower or the operation halts.
The discharge pipe thermistor is used for detecting disconnection of the discharge pipe
thermistor.
(2) Outdoor Heat
Exchanger
Thermistor
The outdoor heat exchanger thermistor is used for controlling the target discharge pipe
temperature. The system sets the target discharge pipe temperature according to the outdoor
and indoor heat exchanger temperature, and controls the electronic expansion valve opening so
that the target discharge pipe temperature can be obtained.
In cooling operation, the outdoor heat exchanger thermistor is used for detecting the
disconnection of the discharge pipe thermistor. When the discharge pipe temperature drops
below the outdoor heat exchanger temperature by more than a certain value, the discharge pipe
thermistor is judged as disconnected.
In cooling operation, the outdoor heat exchanger thermistor is used for high pressure protection.
(3) Outdoor
Temperature
Thermistor
The outdoor temperature thermistor detects the outdoor air temperature and is used for
refrigerant shortage detection, input current control, outdoor fan control, liquid compression
protection function, and so on.
(4) Indoor Heat
Exchanger
Thermistor
The indoor heat exchanger thermistor is used for controlling the target discharge pipe
temperature. The system sets the target discharge pipe temperature according to the outdoor
and indoor heat exchanger temperature, and controls the electronic expansion valve opening so
that the target discharge pipe temperature can be obtained.
In cooling operation, the indoor heat exchanger thermistor is used for freeze-up protection
control. If the indoor heat exchanger temperature drops abnormally, the operating frequency
becomes lower or the operation halts.
In cooling operation, the indoor heat exchanger thermistor is used for anti-icing function. If any
of the following conditions are met in the room where operation halts, it is assumed as icing.
Four way valve
Compressor
(R23851)
Expansion valve
(2) Outdoor Heat
Exchanger
Thermistor
(3) Outdoor
Temperature
Thermistor
(5) Room
Temperature
Thermistor
(1) Discharge Pipe
Thermistor
(4) Indoor Heat
Exchanger
Thermistor
SiUS041638E Thermistor Functions
Functions and Control 32
The conditions are
Tc ≤ – 1° C
Ta – Tc ≥ 10° C
where Ta is the room temperature and Tc is the indoor heat exchanger temperature.
In heating operation, the indoor heat exchanger thermistor is used for heating peak-cut control.
If the indoor heat exchanger temperature rises abnormally, the operating frequency becomes
lower or the operation halts.
In heating operation, the indoor heat exchanger thermistor is used for detecting the
disconnection of the discharge pipe thermistor. When the discharge pipe temperature drops
below the highest indoor heat exchanger temperature by more than a certain value, the
discharge pipe thermistor is judged as disconnected.
When only one indoor unit is operating, the indoor heat exchanger thermistor is used for
subcooling control. The actual subcool is calculated with the liquid pipe temperature and the
indoor heat exchanger temperature. The system controls the electronic expansion valve
openings to obtain the target subcool.
(5) Room
Temperature
Thermistor
The room temperature thermistor detects the room air temperature and is used for controlling
the room air temperature.
Control Specification SiUS041638E
33 Functions and Control
3. Control Specification
3.1 Mode Hierarchy
Outline The air conditioner control has normal operation mode, forced operation mode, and power
transistor test mode for installation and servicing.
Details Cooling Only Model
Heat Pump Model
Note: Unless specified otherwise, dry operation command is regarded as cooling operation.
(R19505)
Air conditioner control mode
Forced operation mode
Forced cooling operation (for pump down operation)
Power transistor test mode
Normal operation mode
Fan
Cooling (includes drying)
Stop (indoor unit: OFF)
Preheating operation
Discharging from capacitor
Stop
Air conditioner control mode
Forced operation mode
Forced cooling operation (for pump down operation)
Power transistor test mode
Normal operation mode
Fan
Cooling (includes drying)
Heating
Heating
Defrosting
Stop (indoor unit: OFF)
Preheating operation
Discharging from capacitor
Stop
(R19522)
SiUS041638E Control Specification
Functions and Control 34
3.2 Frequency Control
Outline The compressor frequency is determined according to the difference between the room thermistor
temperature and the target temperature.
Details For Cooling Only Model
1. Determine command frequency
Command frequency is determined in the following order of priority.
1. Forced cooling
2. Indoor frequency command
2. Determine upper limit frequency
The minimum value is set as an upper limit frequency among the frequency upper limits of the
following functions:
Compressor protection, input current, discharge pipe temperature, freeze-up protection.
3. Determine lower limit frequency
The maximum value is set as a lower limit frequency among the frequency lower limits of the
following function:
Pressure difference upkeep.
4. Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
For Heat Pump Model
1. Determine command frequency
Command frequency is determined in the following order of priority.
1. Limiting defrost control time
2. Forced cooling
3. Indoor frequency command
Command frequency
Limit frequency
Skip control
Lower limit function
Four way valve operation compensation (∗), etc.
Initial frequency
PI control
Defrost control (∗)
Dropping function
Input current control, etc.
Upper limit function
Compressor protection function
Upper limit frequency
FMAX
Lower limit frequency
FMIN
Target frequency
(R17857)
When the shift of the frequency is less than zero (∆F<0) by PI control,
the target frequency is used as the command frequency.
(∗): only for heat pump models
Control Specification SiUS041638E
35 Functions and Control
2. Determine upper limit frequency
The minimum value is set as an upper limit frequency among the frequency upper limits of the
following functions:
Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze-up
protection, defrost control.
3. Determine lower limit frequency
The maximum value is set as an lower limit frequency among the frequency lower limits of the
following functions:
Four way valve operation compensation, draft prevention, pressure difference upkeep.
4. Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
Initial Frequency When starting the compressor, the frequency is initialized according to the ∆D value of the indoor
unit.
∆D signal: Indoor frequency command
The difference between the room thermistor temperature and the target temperature is taken as the
∆D value and is used for ∆D signal of frequency command.
∗OFF = Thermostat OFF
For heating operation only.
PI Control 1. P control
The ∆D value is calculated in each sampling time (20 seconds), and the frequency is adjusted
according to its difference from the frequency previously calculated.
2. I control
If the operating frequency does not change for more than a certain fixed time, the frequency is
adjusted according to the ∆D value.
When ∆D value is low, the frequency is lowered.
When ∆D value is high, the frequency is increased.
3. Frequency control when other controls are functioning
When frequency is dropping:
Frequency control is carried out only when the frequency drops.
For limiting lower limit:
Frequency control is carried out only when the frequency rises.
4. Upper and lower limit of frequency by PI control
The frequency upper and lower limits are set according to the command of the indoor unit.
When the indoor or outdoor unit quiet operation command comes from the indoor unit, the upper
limit frequency is lower than the usual setting.
Temperature
difference
∆D
signal
Temperature
difference
∆D
signal
Temperature
difference
∆D
signal
–2.0°C (–3.6°F) ∗OFF 0°C (0°F) 4 2.0°C (3.6°F) 8
–1.5°C (–2.7°F) 1 0.5°C (0.9°F) 5 2.5°C (4.5°F) 9
–1.0°C (–1.8°F) 2 1.0°C (1.8°F) 6 3.0°C (5.4°F) 10
–0.5°C (–0.9°F) 3 1.5°C (2.7°F) 7 3.5°C (6.3°F) 11
SiUS041638E Control Specification
Functions and Control 36
3.3 Controls at Mode Changing/Start-up
3.3.1 Preheating Operation
Outline The inverter operation in open phase starts with the conditions of the outdoor temperature and the
preheating command from the indoor unit.
Details ON Condition
When the outdoor temperature is below 6°C (42.8°F), the inverter operation in open phase
starts.
OFF Condition
When the outdoor temperature is higher than 8°C (46.4°F), the inverter operation in open phase
stops.
3.3.2 Four Way Valve Switching
Outline The four way valve coil is energized/not energized depending on the operation mode.
(Heating: ON, Cooling/Dry/Defrost: OFF)
In order to eliminate the switching sound as the four way valve coil switches from ON to OFF when
the heating is stopped, the OFF delay switch of the four way valve is carried out.
Details OFF delay switch of four way valve
The four way valve coil is energized for 160 seconds after the operation is stopped.
3.3.3 Four Way Valve Operation Compensation
Outline At the beginning of operation as the four way valve is switched, the pressure difference to activate
the four way valve is acquired when the output frequency is higher than a certain fixed frequency,
for a certain fixed time.
Details Starting Conditions
1. Compressor starts and the four way valve switches from OFF to ON
2. Four way valve switches from ON to OFF during operation
3. Compressor starts after resetting
4. Compressor starts after the fault of four way valve switching
The lower limit of frequency keeps A Hz for B seconds with any conditions 1 through 4 above.
When the outdoor temperature is above C in heating, the frequency decreases depending on the
outdoor temperature.
RK30/36NMVJU RX30/36NMVJU
Cooling Heating Cooling Heating
A (Hz) 46 — 46 52
B (seconds) 60 60
C
(°C) 15 15
(°F) 59 59
Control Specification SiUS041638E
37 Functions and Control
3.3.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning it off.
(The function is not activated when defrosting.)
3.3.5 Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency is set as follows.
(The function is not activated when defrosting.)
RK30/36NMVJU RX30/36NMVJU
Cooling Heating Cooling Heating
A (Hz) 28 — 28 30
B (Hz) 42 — 42 78
C (Hz) 56 — 56 118
D (seconds) 180 — 180 1080
E (seconds) 180 — 180 90
F (seconds) 180 — 180 240
(sec.)
Time
(R13528)
(Hz)
Frequency
C
B
DEF
A
SiUS041638E Control Specification
Functions and Control 38
3.4 Discharge Pipe Temperature Control
Outline The discharge pipe temperature is used as the internal temperature of the compressor. If the
discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep
the discharge pipe temperature from rising further.
Details
RK(X)30/36NMVJU
(°C) (°F)
A 120 248.0
B 111 231.8
C 109 228.2
D 107 224.6
E 107 224.6
Zone Control
Stop zone When the temperature reaches the stop zone, the compressor stops.
Dropping zone The upper limit of frequency decreases.
Keep zone The upper limit of frequency is kept.
Up zone The upper limit of frequency increases.
Reset zone The upper limit of frequency is canceled.
(R14722)
Discharge pipe
temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
E
A
B
C
D
Control Specification SiUS041638E
39 Functions and Control
3.5 Input Current Control
Outline The microcomputer calculates the input current while the compressor is running, and sets the
frequency upper limit based on the input current.
In case of heat pump models, this control is the upper limit control of frequency and takes priority
over the lower limit control of four way valve operation compensation.
Details
Frequency control in each zone
Stop zone
After the input current remains in the stop zone for 2.5 seconds, the compressor is stopped.
Dropping zone
The upper limit of the compressor frequency is defined as operation frequency – 2 Hz.
After this, the output frequency is lowered by 2 Hz every second until it reaches the keep zone.
Keep zone
The present maximum frequency goes on.
Reset zone
Limit of the frequency is canceled.
Limitation of current dropping and stop value according to the outdoor temperature
The current drops when outdoor temperature becomes higher than a certain level (depending
on the model).
RK30/36NMVJU RX30/36NMVJU
Cooling Heating Cooling Heating
A (A) 20 20
B (A) 16.25 — 16.25 18.25
C (A) 15.25 — 15.25 17.25
Compressor Stop
Input current
Dropping zone
Stop zone
Keep zone
Reset zone
(R23249)
A
(A)
B
C
SiUS041638E Control Specification
Functions and Control 40
3.6 Freeze-up Protection Control
During cooling operation, the signal sent from the indoor unit determines the frequency upper limit
and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into
zones.)
The operating frequency limitation is judged with the indoor heat exchanger temperature.
3.7 Heating Peak-cut Control
During heating operation, the indoor heat exchanger temperature determines the frequency upper
limit to prevent abnormal high pressure.
The operating frequency limitation is judged with the indoor heat exchanger temperature.
(R24574)
Reset zone
Indoor heat exchanger
temperature (R2T)
Up zone
Keep zone
Dropping zone
Stop zone
13˚C (55.4˚F)
7˚C (44.6˚F)
5˚C (41.0˚F)
3˚C (37.4˚F)
0˚C (32.0˚F)
RX30/36NMVJU
(°C) (°F)
A 60 140.0
B 57 134.6
C 54 129.2
D 52 125.6
E 47 116.6
Zone Control
Stop zone When the temperature reaches the stop zone, the compressor stops.
Dropping zone The upper limit of frequency decreases.
Keep zone The upper limit of frequency is kept.
Up zone The upper limit of frequency increases.
Reset zone The upper limit of frequency is canceled.
Indoor heat exchanger
temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
(R23928)
D
C
B
A
E
Control Specification SiUS041638E
41 Functions and Control
3.8 Outdoor Fan Control
1. Fan ON control to cool down the electrical box
The outdoor fan is turned ON when the electrical box temperature is high while the compressor is
OFF.
2. Fan OFF control during defrosting
The outdoor fan is turned OFF during defrosting.
3. Fan OFF delay when stopped
The outdoor fan is turned OFF 60 seconds after the compressor stops.
4. Fan speed control for pressure difference upkeep
The rotation speed of the outdoor fan is controlled for keeping the pressure difference during
cooling operation with low outdoor temperature.
When the pressure difference is low, the rotation speed of the outdoor fan is reduced.
When the pressure difference is high, the rotation speed of the outdoor fan is controlled as well
as normal operation.
5. Fan speed control during forced cooling operation
The outdoor fan is controlled as well as normal operation during forced cooling operation.
6. Fan speed control during POWERFUL operation
The rotation speed of the outdoor fan is increased during POWERFUL operation.
7. Fan speed control during indoor/outdoor unit quiet operation
The rotation speed of the outdoor fan is reduced by the command of the indoor/outdoor unit quiet
operation.
8. Fan ON/OFF control when operation (cooling, heating, dry) starts/stops
The outdoor fan is turned ON when the operation starts. The outdoor fan is turned OFF when the
operation stops.
3.9 Liquid Compression Protection Function
Outline In order to increase the dependability of the compressor, the compressor is stopped according to
the outdoor temperature.
Details Operation stops depending on the outdoor temperature
Compressor turns off under the conditions that the system is in cooling operation and outdoor
temperature is below
0°C (32°F)
.
SiUS041638E Control Specification
Functions and Control 42
3.10 Defrost Control
Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat
exchanger temperature must be more than a certain value to finish defrosting.
Details Conditions for Starting Defrost
The starting conditions are determined with the outdoor temperature and the outdoor heat
exchanger temperature.
The system is in heating operation.
The compressor operates for 6 minutes.
More than A minutes (depending on the duration of the previous defrost control) of accumulated
time have passed since the start of the operation, or ending the previous defrosting.
Conditions for Canceling Defrost
The judgment is made with the outdoor heat exchanger temperature (B).
RX30/36NMVJU
A (minute) 15 ~ 25
B
(°C) 6 ~ 30
(°F) 42.8 ~ 86.0
C (Hz) 58
D (Hz) 58
E (seconds) 60
F (seconds) 60
G (seconds) 340
H (seconds) 60
J (seconds) 8
K (pulse) 200
L (pulse) 150
M (pulse) 200
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz 0 Hz
C Hz
D Hz
J sec.
PI control
8 sec.
H sec.
(R21661)
E sec.
F sec.
G sec.
L pulse zone
Electronic
expansion valve
opening
Normal
control
K pulse
zone
M pulse
zone
Starting
control
Control Specification SiUS041638E
43 Functions and Control
3.11 Electronic Expansion Valve Control
Outline The following items are included in the electronic expansion valve control.
Electronic expansion valve is fully closed
1. Electronic expansion valve is fully closed when turning on the power.
2. Pressure equalizing control
Open Control
1. Electronic expansion valve control when starting operation
2. Electronic expansion valve control when the frequency changes
3. Electronic expansion valve control for defrosting
4. Electronic expansion valve control when the discharge pipe temperature is abnormally high
5. Electronic expansion valve control when the discharge pipe thermistor is disconnected
Feedback Control
Target discharge pipe temperature control
Details The following are examples of electronic expansion valve control for each operation mode.
: Available
: Not available
Control
Status
Starting operation control
Control when the frequency changes
Target discharge pipe temperature control
Discharge pipe thermistor disconnection control
High discharge pipe temperature control
Defrost control (heating only)
Pressure equalizing control
Opening limit control
Power on ; Compressor stop
Operation start
Frequency change under starting control
During target discharge pipe temperature control
Frequency change under target discharge pipe
temperature control
Discharge pipe thermistor disconnection
Frequency change under discharge pipe thermistor
disconnection control
During defrost control
SiUS041638E Control Specification
Functions and Control 44
3.11.1 Initialization as Power Supply On
The electronic expansion valve is initialized (fully closed) when the power is turned on. Then, the
valve opening is set and the pressure is equalized.
3.11.2 Pressure Equalizing Control
When the compressor is stopped, the pressure equalizing control is activated. The electronic
expansion valve opens and the pressure is equalized.
3.11.3 Opening Limit Control
The maximum and minimum opening of the electronic expansion valve are limited.
The electronic expansion valve is fully closed when cooling operation stops, and is opened at a
fixed degree during defrosting.
3.11.4 Starting Operation Control
The electronic expansion valve opening is controlled when the operation starts, thus preventing
superheating or liquid compression.
3.11.5 Control when the frequency changes
When the target discharge pipe temperature control is active, if the target frequency changes to a
specified value in a certain period of time, the target discharge pipe temperature control is canceled
and the target opening of the electronic expansion valve is changed according to the frequency
shift.
3.11.6 High Discharge Pipe Temperature Control
When the compressor is operating, if the discharge pipe temperature exceeds a certain value, the
electronic expansion valve opens and the refrigerant runs to the low pressure side. This procedure
lowers the discharge pipe temperature.
3.11.7 Discharge Pipe Thermistor Disconnection Control
Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe
temperature with the condensation temperature. If the discharge pipe thermistor is disconnected,
the electronic expansion valve opens according to the outdoor temperature and the operation
frequency, operates for a specified time, and then stops.
After 3 minutes, the operation restarts and checks if the discharge pipe thermistor is disconnected.
If the discharge pipe thermistor is disconnected, the system stops after operating for a specified
time.
If the disconnection is detected repeatedly, the system is shut down. When the compressor runs for
60 minutes without any error, the error counter is reset.
RK(X)30/36NMVJU
Maximum opening (pulse) 480
Minimum opening (pulse) 56
Control Specification SiUS041638E
45 Functions and Control
Details Determining thermistor disconnection
When the starting control (Cooling:
A
seconds, Heating:
B
seconds) finishes, the detection timer for
disconnection of the discharge pipe thermistor (
C
seconds) starts. When the timer is over, the
following adjustment is made.
1. When the operation mode is cooling
When the following condition is fulfilled, the discharge pipe thermistor disconnection is
ascertained.
Discharge pipe temperature +6°C (+10.8°F) < outdoor heat exchanger temperature
2. When the operation mode is heating
When the following condition is fulfilled, the discharge pipe thermistor disconnection is
ascertained.
Discharge pipe temperature +6°C (+10.8°F) < indoor heat exchanger temperature
When the thermistor is disconnected
When the disconnection is ascertained, the compressor continues operation for 9 minutes and then
stops.
If the compressor stops repeatedly, the system is shut down.
3.11.8 Target Discharge Pipe Temperature Control
The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger
temperature, and the electronic expansion valve opening is adjusted so that the actual discharge
pipe temperature becomes close to the target discharge pipe temperature. (Indirect SH
(superheating) control using the discharge pipe temperature)
The electronic expansion valve opening and the target discharge pipe temperature are adjusted
every A seconds. The opening degree of the electronic expansion valve is adjusted by the
following.
Target discharge pipe temperature
Actual discharge pipe temperature
Previous discharge pipe temperature
RK(X)30/36NMVJU
A (seconds) 180
B (seconds) 60
C (seconds) 1020
RK(X)30/36NMVJU
A (seconds) 20
SC
(Subcooling)
SH
(Superheating)
The target discharge pipe
temperature is set as to become
the target SH.
The inclination does not change
depending on the operating condition.
(R23014)
SiUS041638E Control Specification
Functions and Control 46
3.12 Malfunctions
3.12.1 Sensor Malfunction Detection
Sensor malfunction can be detected in the following thermistors:
1. Outdoor heat exchanger thermistor
2. Discharge pipe thermistor
3. Radiation fin thermistor
4. Outdoor temperature thermistor
3.12.2 Detection of Overcurrent and Overload
Outline An excessive output current is detected and the OL temperature is observed to protect the
compressor.
Details
If the OL (compressor head) temperature exceeds 130°C (266°F), the system shuts down the
compressor.
If the inverter current exceeds 20 A, the system shuts down the compressor.
The upper limit of the current decreases when the outdoor temperature exceeds a certain level.
SiUS041638E Remote Controller
Remote Controller 48
1. Remote Controller
Reference Refer to the following pages for details.
Note: Refer to the operation manual of applicable model for details. You can download operation
manuals from Daikin Business Portal:
Daikin Business Portal → Document Search → Item Category → Installation/Operation Manual
(URL: https://global1d.daikin.com/business_portal/login/
)
< ARC466A37 >
Signal transmitter
Powerful
1
button
• Starts POWERFUL operation.
Display (LCD)
• Changes the temperature setting.
On/Off button
Auto Indoor unit quiet Low
Middle low
MiddleMiddle highHigh
• Press this button once to
start operation.
Press once again to stop it.
Temperature
adjustment buttons
• Displays the current settings.
(In this illustration, each section is
shown with all its displays on for the
purpose of explanation.)
• To use the remote controller, aim the
transmitter at the indoor unit. If there
is anything blocking the signals
between the unit and the remote
controller, such as a curtain, the unit
may not operate.
• The maximum transmission distance
is about 23 ft (7 m).
Fan setting button
• In indoor unit quiet operation,
operation sound becomes weak.
(The airflow rate also decreases.)
• In DRY operation, the airflow rate
setting is not available.
• Selects the airflow rate setting
every time you press this button.
(R24530)
: AUTO
: DRY
: COOL
: HEAT
: FAN
18 ~ 30 °C
(64 ~ 86 °F)
Not available
18 ~ 32 °C
(64 ~ 90 °F)
10 ~ 30 °C
(50 ~ 86 °F)
Not available
Receiver
1 POWERFUL operation P.22
Remote Controller SiUS041638E
49 Remote Controller
Open the Front Cover
Reference Refer to the following pages for details.
Note: Refer to the operation manual of applicable model for details. You can download operation
manuals from Daikin Business Portal:
Daikin Business Portal → Document Search → Item Category → Installation/Operation Manual
(URL: https://global1d.daikin.com/business_portal/login/
)
Swing
5
buttons
On Timer button
Clock
7
button
Select button
• Press this button and adjust
the day of the week and time
with Select button.
Press this button again to
complete TIMER setting.
Timer Cancel button
• Cancels the timer setting.
• It cannot be used for the
WEEKLY TIMER operation.
• Changes the ON/OFF
TIMER and WEEKLY
TIMER settings.
• Adjusts the airflow direction.
• When you press Swing
button, the flap moves up and
down, or (and) the louver
moves right and left. The flap
(louver) stops when you press
Swing button again.
• Press this button and adjust
the day of the week and
time with Select button.
Press this button again to
complete TIMER setting.
(R24630)
: Weekly button
: Program button
: Copy button
: Back button
: Next button
• OUTDOOR UNIT QUIET
operation is not available in
FAN and DRY operation.
• OUTDOOR UNIT QUIET
operation and ECONO
operation cannot be used at
the same time with
POWERFUL operation.
Priority is given to the
function you pressed last.
Econo
4
/ Quiet button
Blank
No setting
Combination
Comfort/Sensor button
(COMFORT AIRFLOW
Operation
2
/ INTELLIGENT
EYE Operation
3
)
INTELLIGENT
EYE
COMFORT
AIRFLOW
• Every time you press
Comfort/Sensor button, the
setting changes in the
following order.
ECONO
Blank
No setting
Combination
• Every time you press
Econo/Quiet button, the
setting changes in the
following order.
OUTDOOR UNIT
QUIET
Mode button
• Selects the operation mode.
Off Timer button
(NIGHT SET mode)
Weekly button
(WEEKLY TIMER
Operation
6
)
(heat pump only)
AUTO DRY COOL HEAT FAN
(heat pump only)
2 COMFORT AIRFLOW
P.15, 16
5Auto-swing P.15
3
INTELLIGENT EYE
operation
P.21 6 WEEKLY TIMER operation P.24
4 ECONO operation P.20 7 Clock setting P.23
SiUS041638E
Service Diagnosis 50
Part 6
Service Diagnosis
1. General Problem Symptoms and Check Items .........................................52
2. Troubleshooting with LED .........................................................................53
2.1 Indoor Unit.................................................................................................. 53
2.2 Outdoor Unit ............................................................................................... 53
3. Service Diagnosis .....................................................................................54
4. Troubleshooting ........................................................................................57
4.1 Error Codes and Description ...................................................................... 57
4.2 Indoor Unit PCB Abnormality ..................................................................... 58
4.3 Freeze-up Protection Control/Heating Peak-cut Control ............................ 60
4.4 Indoor Fan Motor (DC Motor) or Related Abnormality ............................... 61
4.5 Thermistor or Related Abnormality (Indoor Unit)........................................ 63
4.6 Low-voltage Detection or Over-voltage Detection...................................... 64
4.7 Signal Transmission Error (between Indoor Unit and Outdoor Unit) .......... 66
4.8 Signal Transmission Error on Outdoor Unit PCB ....................................... 68
4.9 Mismatching of Indoor Unit and Outdoor Unit ............................................ 69
4.10 Outdoor Unit PCB Abnormality................................................................... 70
4.11 OL Activation (Compressor Overload) ....................................................... 71
4.12 Compressor Lock ....................................................................................... 73
4.13 DC Fan Lock (Outdoor Fan)....................................................................... 74
4.14 Input Overcurrent Detection ....................................................................... 75
4.15 Four Way Valve Abnormality...................................................................... 76
4.16 Discharge Pipe Temperature Control......................................................... 78
4.17 High Pressure Control in Cooling ............................................................... 79
4.18 System Shutdown due to Compressor Internal Temperature
Abnormality ................................................................................................ 80
4.19 Compressor System Sensor Abnormality .................................................. 81
4.20 Position Sensor Abnormality ...................................................................... 82
4.21 CT or Related Abnormality ......................................................................... 84
4.22 Thermistor or Related Abnormality (Outdoor Unit)..................................... 86
4.23 Electrical Box Temperature Rise................................................................ 88
4.24 Radiation Fin Temperature Rise ................................................................ 89
4.25 Output Overcurrent Detection .................................................................... 90
5. Check ........................................................................................................92
5.1 Thermistor Resistance Check .................................................................... 92
5.2 Indoor Fan Motor Connector Output Check ............................................... 93
5.3 Power Supply Waveforms Check............................................................... 93
5.4 Electronic Expansion Valve Check............................................................. 94
5.5 Four Way Valve Performance Check ......................................................... 95
5.6 Inverter Unit Refrigerant System Check..................................................... 95
5.7 Inverter Analyzer Check ............................................................................. 96
5.8 Rotation Pulse Check on the Outdoor Unit PCB ........................................ 98